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PowerAC Trapezoidal Assembly 903 RA w/Plastic Nut

Trapezoidal Lead Screw Assembly, Tr 20 x 4, 4140, RH, Plastic Nut Read More
Product Specifications

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Product Specifications

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Specifications Diagram

Trapezoidal Lead Screw

(Screw)Product Info

Screw Code:
903 RA
Screw Material:
4140 Series
Thread Direction:
RH

(Screw)Details

Diameter:
20
Lead:
4
Starts:
1
Pitch [mm]:
4
Lead Accuracy +/- [μm/25mm]:
6.25
Thread Code:
903
End Code for Types 1,2,3,5 [* Journals may show tracings of the thread]:
12
End Code for Type 4 [* Journals may show tracings of the thread]:
8

(Screw)Dimensions

A - Root Diameter Mmmimum [mm]:
14.90
D - Nominal Rod Diameter:
20

(Screw)Part Numbers

1800 mm Part Number:
15903
3600 mm Part Number:
16903
900 mm Part Number:
14903

(Screw)Weight

Weight Per Meter [kg]:
2

Trapezoidal Lead Nut

(Nut)Product Info

Part Number:
30903
Thread Direction:
RH
Type:
Plastic

(Nut)Details

Diameter:
20
Lead [mm]:
4
Starts:
1
Pitch [mm]:
4
Lash (Maximum Axial in) [mm]:
0.24
Nominal Rod Diameter:
20
Thread Code:
903

(Nut)Dimensions

B [mm]:
32.0
C [mm]:
34.0
E [mm]:
13.00
F (n) Dia. [mm]:
(4) 7.00
F BCD [mm]:
60.00
G [mm]:
14.0
H [mm]:
75.0
J [mm]:
M30x1.5

(Nut)Forces and Torques

Torque to Raise 1 kN [Nm]:
1.580

(Nut)Flange Part Numbers

Flange Part Number:
72003

(Nut)Weight

Flange Weight [kg]:
0.39
Nut Weight [g]:
31

(Nut)Performance Specifications

Efficiency [%]:
40
Lead Accuracy +/- [μm/25mm]:
6.25
Dynamic Load Capacity [N]:
6895
Static Load Capacity [N]:
6895

More Details

Nook Industries Offers the largest selections of rolled amce screw sizes in the industry. Rolled thread screws are cost effective and are stocked for quick delivery.

Similar in construction and materials to PowerAc™ Inch Acme Screws and Nuts, the Trapezoidal thread form screws and nuts include a centralizing (C) thread form to prevent wedging and binding. When compared to general-purpose thread forms (G), centralizing threads are manufactured with tighter tolerances and reduced clearance on the major diameter.

Plastic Inch Acme

The high strength and inherent lubricity of plastic Acme and Trapezoidal nut material can result in product life that can equal or exceed conventional nut materials.
  • Tensile Strength @70°F: 8,000 psi
  • Compressive Strength @70°F: 16,000 psi
  • PV Limit: 2,700 lubricated
  • Co-efficient of friction: 0.10 lubricated